Xylem ________.
a. is a vessel that carries water in plants
b. is a partial division between fungal cells
c. is found in nonvascular plants
d. makes spores in fungi
Ans: a. is a vessel that carries water in plants
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What is the correct order for the following events that follow a nerve impulse along a sympathetic neuron to innervate
the heart? 1) G protein activates adenylyl cyclase 2) Neuron releases norepinephrine 3) Cyclic AMP activates protein kinase 4) Receptor activates G protein 5) Protein kinase phosphorylates Ca2+ channels 6) Receptors activated on the membrane of the cardiac muscle a. 1, 3, 4, 5, 2, 6 b. 5, 3, 4, 1, 2, 6 c. 6, 2, 4, 1, 3, 5 d. 2, 6, 4, 1, 3, 5
e. 2, 3, 4, 1, 6, 5The California populations of the Northern elephant seal are descendants from a very small population of seals that was overhunted in the 1890s. Heterozygosity in this population would be expected to be ________ due to ________.
A. great; a bottleneck effect B. slight; a bottleneck effect C. great; assortive mating D. slight; the founder effect E. great; disruptive selection
Birds and fishes overcome gravitational forces primarily through their ________.
A. body shape and density B. lubricating secretions C. smooth outer covering D. textured surface E. reduced surface area in contact with the ground
A plant's first line of defense against infection is
A) cell elongation. B) its epidermis. C) phytochrome. D) salicylic acid.